lab5p2

lab5p2.c

#include <hidef.h>      /* common defines and macros */
#include <MC9S12C128.h>     /* derivative information */
#include <time.h>
#include <stdio.h>

void delay(int d);
int update_delay_time(int last_delay_time);
int delay_time=9400;
int set_delay=  500;



void delay(int d) 
{
  
    while( d > 0 )
     {
          d--;
     }
        
}

int update_delay_time(int last_delay_time) 
{
     //read from button
     if (PTM_PTM4 == 0) {
        delay(set_delay);
        //increment delay time
        last_delay_time = last_delay_time +3000;
        while(PTM_PTM4==0) {
            delay(set_delay);
        }
        
        delay(set_delay);
        
      
     }
     else if (PTM_PTM5 == 0 && last_delay_time >= 0) 
           {
             delay(set_delay);
             last_delay_time = last_delay_time - 3000;
              
                while (PTM_PTM5==0)
                {
              
                  delay(set_delay);
               
                  }
                 delay(set_delay);
               
          } 
     
     return last_delay_time;
     
}

int a [9]={0x0, 0x01, 0x03, 0x07, 0x0F, 0x1F, 0x3F, 0x7F, 0xFF};


void main(void) 
{   
    int i;                       
  	DDRA = 0xFF;   // Active port A
	  PERP = 0x01;   // Attach pullups tp PTP<1:0>
	 
    PERM = 0x30;        // PB7,PB8 pullup resistors are enabled
    PTM   = 0xFF;       // Clear register initially 
	
	//turn LEDs off
	
	PORTA=0x00;
	
	
	
	while(1) {
	  
  	for(i=0; i<8; i++)
  	{
  		delay(delay_time);
  	  PORTA=a[i];
  	
  		  
  	}
  	
  	for(i=8; i>0; i--)
  	{
  		delay(delay_time);
  	  PORTA=a[i];
  		
  		  
  	}
  	
     delay_time = update_delay_time(delay_time);
	
	}//end while

	
}